Sparse Virtual Texture For RealTime

This proposal suggests adding Sparse Virtual Textures (SVT) as an optional feature in Blender’s rendering engines (Cycles/Eevee/Viewport).
SVT lets artists use extremely large or numerous textures without overloading GPU memory , because only the visible parts of each texture are streamed to the GPU in real time.

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Why It Matters

Modern projects often rely on huge textures and many UDIMs .
Today we must either reduce texture size or buy expensive GPUs.
SVT solves this by streaming texture “tiles” on demand so the GPU only keeps the tiles you can actually see.

Examples in the industry :

• Adobe Substance 3D Painter uses SVT to paint and preview extremely large assets.
• id Software pioneered the concept with their MegaTexture technology in games like Rage .
• Amplify Texture brings virtual texturing to Unity for massive worlds.
• Open-source demos like Silver Spaceship SVT and StudioPixl’s article show clear, practical approaches.

Resulting benefits:

• Work with virtually unlimited texture size
• Lower VRAM usage
• Faster viewport interaction on complex environments

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How It Works (in simple View)

Think of a giant image cut into small square pages:

• Blender keeps a low-resolution version always loaded.
• As the camera moves closer, the system streams higher-detail pages where you look.
• Old pages you no longer see are released automatically.

This happens in the background, so artists just paint and render as usual.

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Vulkan & Performance

Vulkan already supports SVT via Sparse Images , which let the GPU map only the needed pages.
Real-time performance is solid when streaming is well managed.
Some drivers still need optimisation, but production tools show it is practical today for interactive work and final renders.

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Proposed Implementation in Blender

• New Option : Enable Sparse Virtual Textures in Scene or Render Settings.
• Parameters for page size and memory budget.
• Works in Cycles, Eevee and the real-time viewport.
• Automatic fallback to normal textures if hardware does not support SVT.

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Benefits for Blender Users

• Massive environments such as cities or landscapes without texture downsizing.
• Heavy asset libraries with many 4K/8K UDIMs.
• Reduced memory pressure on mid-range GPUs, keeping scenes responsive.

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SOOOOOOO

Sparse Virtual Textures would let Blender handle extremely large texture data with much less GPU memory, bringing professional game-engine and film-production techniques into open-source 3D creation by combinning multiple technics and not only one like MipsMaps could be insuffisant !